Improvement in machines for turning pulleys



UNITED STATES GEORGE A. GRAY, JR.,

PATENT OFFICE.

OF HAMILTON, OHIO.

IMPROVEMENT IN MACHINES FOR TURNING PULLEYS.

Speciiication formingl part of Letters Patent No. 1I$S,394, dated April29, 1873 application tiled. August 20, 1872.

To all whom it may concern:

Beit known that I, GEORGE A. GRAY, Jr., of Hamilton, Butler county,State of Ohio, have invented a certain new and useful Machine forTurning Pulleys, of which the following is a specification:

Natnrc and Objects of Intention.

Description of the Accompanying Drawing.

Figure 1 is a side elevation of my machine with the pulley anddriving-dog in section. Fig. 2 is a perspective vewot' therevolvingtable, on which the driving-dog is attached, as shown.

General Description.

A is the bed-plate ofthe machine; B B', the side housings; O, thestationary top rail or brace 5 and D, the vertically-sliding rail. E isa stationary block, similar in construction to the tail-block of a lathehaving a sliding center, e, operated by hand-wheel c. This block isattached tothe rail D. F is the revolving driving-table suitablyconnected by beltin g or otherwise to the driving mechanism of themachine, and having an interior aperture, f, either in itself or astationary bush for the inl sertion of a center, ff, for the lower endofthe mandrel G. The mandrel turns between the` centers c f in a mannersimilar to those which are used to support work between the centers of alathe, and is fitted snugly to the bored hub of the pulley H. The dog Iwhich is used to drive the pulley is of the following construction: ItsWings i are iitted with drivingstuds J, secured each in one of theseries of holes t', the series being provided to enable the studs`todrive diii'erent sizes of pulleys. The wings i" of the dog are securedloosely to the table by bolts K, which pass through elongated holes inthe said wings, the slots permitting the dog to have a lateral movement,so as to allow the driving-studs J to adjust themselves toirregularities in the arms of the pul Aley, and thus press with equalpressure upon the opposite arms of the pulley for driving.

The sliding saddles L carry two cutters, M M',

which can be adjusted to any desired angle, so that both may be cuttingat the same time, and onebe forming one side'of the crown of the pulleyand the other the opposite side, as shown in Fig. 1; or both may beoperating together with different depths of cut upon the same side ofthe crown. The tools have the cross-feed and downfeed peculiar toboringmills.

Ola-im.

The combinatiomin the usual or suitable frame-work of a pulley-turningmachine, of revolving table F, tail-block E, self-adjusting Vdriving-dogI J K, and adjustable cutters L

